The hypothesis of bacterial origin of mitochondria, which existed until the end of the 20th century, has been confirmed on the basis of the current concepts of organic world evolution in the open sea hydrosphere and original data on the entry of bacteria (prokaryotes0 in the cells of eukaryotes and their transformation into the mitochondrial mechanism of aerobic energy metabolism. This hypothesis can now be considered as a factually substantiated theory. The process of endocytosis of bacteria in the tissues of eukaryotes, which began at the onset of transition of the anaerobic state of open sea hydrosphere and land atmosphere (Early Proterozoic), is considered as the beginning of symbiotic mode of life of organisms of the Proterozoic and Postproterozoic organic world.
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